<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8"/>
  </head>
  <body>
    <input type="button" value="Add" onclick="callAdd()" />

    <script>
      function callAdd() {
        const result = Module.ccall('Add',
            'number',
            ['number', 'number'],
            [1, 2]);

        console.log(`Result: ${result}`);
      }
    </script>
    <script src="js_plumbing.js"></script>
  </body>
</html>
